Elevator



UNITED STATES PATENT GEORGE H. ROEHM, OF DAYTON, OHIO.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 313,887 dated March 17,1885. Application filed November 26, 1884. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE H. RoEHM, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented certain new and useful Improvements in Elevators; and I dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, ref+ erence beinghad to the accompanying drawings, and to the letters of reference markedthereon, which form a part of this specification.

My invention relates to improvements in elevators; and it consists,solely, of a device for opening and closing the hatchway after thepassage of the elevator-platform, both in its ascent and descent, theseveral features of which will be fully hereinafter set forth.

The mechanism is illustrated inthe accompanying drawings, in whichFigure I is a side view of the elevator. Fig. II is a hori- I zontalsection on line 00.

Similar letters designate like parts in both views.

In the elevator proper I make no change in the construction from thosein general use, and the frame A but serves to support the partsnecessary to illustrate my invention and take the place of the joistsand floor of a building; and,further,I have used only such parts as areessential to exhibit the operation of my device.

13 are the guide-rails, and E the guides to which the platform F isattached. The platform is carried by a rope passing over a pulley at thetop of the building, which rope is attached to a beam connected at thetop of the guides over the platform. To the side of the frame,corresponding to a joist, are bolted the arms t t, which form bearingsfor the shaft 7 S. To this shaft are fixedly attached the arms O 0.These arms are attached to the door 0, and the outer ends of these armssupport a rod on which are supported a series of weights,n,which areused as a partial counterbalance to the door.

To the inner end of shaft S is fixedly attached the pinion J, and theabutting pinion 1 is loose upon the shaft, and is limited in itsmovement by friction,the button y,which arrests the movement of thecrank w, and the rod 0, which connects the pinion to said crank. Theaforesaid pinions engage the double rack G, which is bolted to the sideof the guide, so as to engage said pulleys as the platform is moved upor down. The crank it is pivoted to the arm a, which is bolted to theunder side of the door, near its center, the button y,on its lower face,serving to prevent the crank from dropping below the center of its axis,and thereby arresting the movement of the pinion,which is connected bythe rod '12 to said crank.

To the door 0 is hinged a supplementary door, D. (See Fig. II.) Thisdoor is necessary to fill the remaining space which cannot be covered bythe other door. The latter is carried by the crank when moved by thepinion in position at aright angle to the former, (sec position Fig. 1,)and when not thus held by the crank it falls by gravity into ahorizontal position. The rack has teeth enough to engage the pinions andcarry them about one-fourth of a circle.

The two sides of the device are identical,and therefore but one isillustrated.

In Fig. Ithe hatchway is shown open, and the operation will be readilyunderstood. As the platform descends, the outer teeth of the rack engagethe pinion I, which causes the crank to move the supplementary dooronefourth of a circle out of the way of the guidepost and guides. Thenthe inner teeth engage the pinion J, which carries the door 0 to avertical position. The platform passes, and a like rack, attached to theguides above, effects the closing of the hatch way. Thus the double rackcarried on the guides of theplatform opens and closes the severalhatchways of the floors of a building. The objects are to preventacoidents and the destruction from fires resulting from open hatchways.

Having fully described myinvention,what I claim, and desire to secure byLetters Patent, 1s-

on shaft S within bearings t t, supplementary door D, hinged to theformer, and having an arm, or, attached thereunto,pinionsI J on saidshaft, double rack G, attached to platform- 1. The combination of thedoor G,suspended guides,;oonnection-rod v, and crank w,pivotedIn-testimony that I claim the foregoing as to said arm, substantially asdescribed. my own I afiix my signature in presence of two 2. Thecombination, substantially as set witnesses. forth, of the door 0,supplementary door D, GEORGE E. ROEHM. 5 shaft S, arms 0 o,counterbalance-weights n, Witnesses:

pinions I J, double rack G, connection-rod '0, B. PIOKERING, crank w,and arm 20. SUMNER T. SMITH.

